ERDDAP > info > bcodmo_dataset_733237

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
		data	graph		files	public	Water column nitrate+nitrite d15N measurements from R/V L'Atalante in the southwest Pacific Ocean between New Caledonia and Tahiti from February to March 2015		I   M	background			BCO-DMO	bcodmo_dataset_733237

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	access_formats	String	.htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson
attribute	NC_GLOBAL	acquisition_description	String	NO3-+NO2- d15N analysis was by the \u201cdenitrifier method\u201d and followed the methods described by Sigman et al., 2001, Casciotti et al., 2002, McIlvin and Casciotti, 2011, and Weigand et al., 2016. Briefly, NO3-+NO2- was quantitatively reduced to N2O by Pseudomonas aureofaciens and Pseudomonas chlororaphis, which was then cryogenically focused and analyzed on an isotope ratio mass spectrometer. A volume of sample was added to each bacterial vial to achieve a final quantity of 10 or 20 nmols N2O, which was then purged from the vial using a helium carrier gas. The d15N of N2O in samples was calibrated with the international isotopic reference materials described in the Processing Description.
attribute	NC_GLOBAL	awards_0_award_nid	String	710561
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1537314
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1537314
attribute	NC_GLOBAL	awards_0_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_0_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_0_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_0_program_manager	String	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51517
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Station location and NO3+NO2 d15N values measured for the OUTPACE long duration (LD) stations. PI: Angela Knapp Version: 2018-04-11
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	info at bco-dmo.org
attribute	NC_GLOBAL	creator_name	String	BCO-DMO
attribute	NC_GLOBAL	creator_type	String	institution
attribute	NC_GLOBAL	creator_url	String	https://www.bco-dmo.org/
attribute	NC_GLOBAL	data_source	String	extract_data_as_tsv version 2.3 19 Dec 2019
attribute	NC_GLOBAL	date_created	String	2018-04-11T19:49:07Z
attribute	NC_GLOBAL	date_modified	String	2018-09-20T17:38:55Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.733303
attribute	NC_GLOBAL	Easternmost_Easting	double	168.0118
attribute	NC_GLOBAL	geospatial_lat_max	double	-18.179
attribute	NC_GLOBAL	geospatial_lat_min	double	-19.9832
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	168.0118
attribute	NC_GLOBAL	geospatial_lon_min	double	-172.7813
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	geospatial_vertical_max	double	2002.0
attribute	NC_GLOBAL	geospatial_vertical_min	double	3.0
attribute	NC_GLOBAL	geospatial_vertical_positive	String	down
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/733237
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	IR Mass Spec
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	Nitrate+nitrite d15N was measured using a Thermo Finnigan Delta V isotope ratio mass spectrometer.
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	733270
attribute	NC_GLOBAL	instruments_0_description	String	The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).
attribute	NC_GLOBAL	instruments_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/LAB16/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Isotope-ratio Mass Spectrometer
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	469
attribute	NC_GLOBAL	instruments_0_supplied_name	String	Thermo Finnigan Delta V isotope ratio mass spectrometer.
attribute	NC_GLOBAL	keywords	String	bco, bco-dmo, biological, cast, chemical, d15, data, dataset, date, density, depth, dmo, earth, Earth Science > Oceans > Salinity/Density > Density, erddap, latitude, longitude, management, nitrate, nitrite, no2, no3, NO3_NO2, NO3_NO2_d15N, NO3_NO2_d15N_1_SD, ocean, oceanography, oceans, office, preliminary, salinity, science, sea, sea_water_sigma_theta, seawater, sigma, Sigma_theta, station, theta, water
attribute	NC_GLOBAL	keywords_vocabulary	String	GCMD Science Keywords
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/733237/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/733237
attribute	NC_GLOBAL	Northernmost_Northing	double	-18.179
attribute	NC_GLOBAL	param_mapping	String	{'733237': {'Latitude': 'flag - latitude', 'Depth': 'flag - depth', 'Longitude': 'flag - longitude'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/733237/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	Florida State University
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	FSU
attribute	NC_GLOBAL	people_0_person_name	String	Angela N. Knapp
attribute	NC_GLOBAL	people_0_person_nid	String	555499
attribute	NC_GLOBAL	people_0_role	String	Principal Investigator
attribute	NC_GLOBAL	people_0_role_type	String	originator
attribute	NC_GLOBAL	people_1_affiliation	String	Mediterranean Institute of Oceanography
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	MIO
attribute	NC_GLOBAL	people_1_person_name	String	Sophie Bonnet
attribute	NC_GLOBAL	people_1_person_nid	String	663895
attribute	NC_GLOBAL	people_1_role	String	International Collaborator
attribute	NC_GLOBAL	people_1_role_type	String	originator
attribute	NC_GLOBAL	people_2_affiliation	String	Mediterranean Institute of Oceanography
attribute	NC_GLOBAL	people_2_affiliation_acronym	String	MIO
attribute	NC_GLOBAL	people_2_person_name	String	Thierry Moutin
attribute	NC_GLOBAL	people_2_person_nid	String	663893
attribute	NC_GLOBAL	people_2_role	String	International Collaborator
attribute	NC_GLOBAL	people_2_role_type	String	originator
attribute	NC_GLOBAL	people_3_affiliation	String	Mediterranean Institute of Oceanography
attribute	NC_GLOBAL	people_3_affiliation_acronym	String	MIO
attribute	NC_GLOBAL	people_3_person_name	String	Oliver Grosso
attribute	NC_GLOBAL	people_3_person_nid	String	733295
attribute	NC_GLOBAL	people_3_role	String	Scientist
attribute	NC_GLOBAL	people_3_role_type	String	originator
attribute	NC_GLOBAL	people_4_affiliation	String	Villefranche Oceanographic Laboratory
attribute	NC_GLOBAL	people_4_affiliation_acronym	String	LOV
attribute	NC_GLOBAL	people_4_person_name	String	Nathalie Leblond
attribute	NC_GLOBAL	people_4_person_nid	String	733296
attribute	NC_GLOBAL	people_4_role	String	Scientist
attribute	NC_GLOBAL	people_4_role_type	String	originator
attribute	NC_GLOBAL	people_5_affiliation	String	Florida State University
attribute	NC_GLOBAL	people_5_affiliation_acronym	String	FSU
attribute	NC_GLOBAL	people_5_person_name	String	Kelly M. McCabe
attribute	NC_GLOBAL	people_5_person_nid	String	733294
attribute	NC_GLOBAL	people_5_role	String	Student
attribute	NC_GLOBAL	people_5_role_type	String	related
attribute	NC_GLOBAL	people_6_affiliation	String	Florida State University
attribute	NC_GLOBAL	people_6_affiliation_acronym	String	FSU
attribute	NC_GLOBAL	people_6_person_name	String	Angela N. Knapp
attribute	NC_GLOBAL	people_6_person_nid	String	555499
attribute	NC_GLOBAL	people_6_role	String	Contact
attribute	NC_GLOBAL	people_6_role_type	String	related
attribute	NC_GLOBAL	people_7_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_7_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_7_person_name	String	Mathew Biddle
attribute	NC_GLOBAL	people_7_person_nid	String	708682
attribute	NC_GLOBAL	people_7_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_7_role_type	String	related
attribute	NC_GLOBAL	project	String	SW Pac N2 fixation
attribute	NC_GLOBAL	projects_0_acronym	String	SW Pac N2 fixation
attribute	NC_GLOBAL	projects_0_description	String	NSF Award Abstract: The availability of nitrogen in the surface ocean plays a critical role regulating rates of primary productivity in the ocean, and thus through modification of the carbon cycle, nitrogen has the capacity to influence climate. The dominant source of biologically available nitrogen to the ocean is through a process known as di-nitrogen (N2) fixation, which involves the reduction of N2 gas dissolved in seawater to ammonium by microbes referred to as diazotrophs. While significant progress has been made identifying a diversity of marine diazotrophs in recent years using molecular tools, quantifying global rates of N2 fixation, and identifying which ocean basin supports the highest fluxes, has remained a vexing question. This research will quantify rates of N2 fixation as well as its importance for supporting production in the southwest Pacific Ocean. Results from this research will shed light on the sensitivities of N2 fixation (temperature, iron concentrations) as well as the extent of spatial and temporal coupling of nitrogen sources and sinks in the ocean. The work will be carried out by an early career scientist, and involve mentoring of young women, middle school girls and minorities, training of undergraduate and graduate researchers, and international collaborations. Identifying the spatial distribution of the largest di-nitrogen (N2) fixation fluxes to the ocean remains a critical goal of chemical oceanography. The spatial distribution can inform our understanding of the environmental sensitivities of N2 fixation and the capacity for the dominant marine nitrogen (N) source and sink processes to respond to each other and thus influence the global carbon cycle and climate. In addition to temperature, two factors are at the heart of the current debate over what influences the spatial distribution of N2 fixation in the ocean: 1) the presence of adequate iron to meet the needs of N2 fixing microbes, and, 2) the absolute concentrations as well as ratios of surface ocean nitrate and phosphate concentrations that are low relative to the "Redfield" ratio, which are thought to favor N2 fixing microbes. This project will test the effects of gradients in atmospheric dust deposition on N2 fixation rates when surface waters have relatively constant but favorable nitrate to phosphate concentrations. The work will be carried out in the southwest Pacific, a region highlighted by new modeling work for its unique geochemical characteristics that are expected to favor significant N2 fixation fluxes. Nitrate+nitrite d15N as well as total dissolved nitrogen (TDN) concentration and d15N will be measured in water column samples collected on a French cruise and sediment traps were deployed to capture the sinking particulate N flux. The results will be compared with published work to evaluate which ocean regions support the largest N2 fixation fluxes. More information: This project was part of the Oligotrophy to UlTra-oligotrophy PACific Experiment (OUTPACE) cruise in the Southwest Pacific between New Caledonia (166°28' E; 22°14' S) and Tahiti (149°36' W; 17°34' S) 0-2000 m​ * OUTPACE cruise (doi: https://dx.doi.org/10.17600/15000900) * OUTPACE website: https://outpace.mio.univ-amu.fr/?lang=en
attribute	NC_GLOBAL	projects_0_end_date	String	2018-07
attribute	NC_GLOBAL	projects_0_geolocation	String	Southwest Pacific Ocean between New Caledonia and Tahiti along ~18 deg S
attribute	NC_GLOBAL	projects_0_name	String	Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean
attribute	NC_GLOBAL	projects_0_project_nid	String	710562
attribute	NC_GLOBAL	projects_0_project_website	String	http://scope.soest.hawaii.edu/data/lava/lava.html
attribute	NC_GLOBAL	projects_0_start_date	String	2015-08
attribute	NC_GLOBAL	publisher_name	String	Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute	NC_GLOBAL	publisher_type	String	institution
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	-19.9832
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	Constraining the rates and spatial distribution of di-nitrogen (N2) fixation fluxes to the ocean informs our understanding of the environmental sensitivities of N2 fixation as well as the timescale over which the fluxes of nitrogen (N) to and from the ocean may respond to each other. Here we quantify rates of N2 fixation as well as its contribution to export production along a zonal transect in the Western Tropical South Pacific (WTSP) Ocean using N isotope (\u201cd15N\u201d) budgets. Comparing measurements of water column nitrate+nitrite d15N with the d15N of sinking particulate N at a western, central, and eastern station, these d15N budgets indicate high, modest, and low rates of N2 fixation at the respective stations. The results also imply that N2 fixation supports exceptionally high, i.e., >50%, of export production at the western and central stations, which are also proximal to the largest iron sources. These geochemically-based rates of N2 fixation are equal to or greater than those previously reported in the tropical North Atlantic, indicating that the WTSP Ocean has the capacity to support globally significant rates of N2 fixation, which may compensate for N removal in the oxygen deficient zones of the eastern tropical Pacific.
attribute	NC_GLOBAL	title	String	Water column nitrate+nitrite d15N measurements from R/V L'Atalante in the southwest Pacific Ocean between New Caledonia and Tahiti from February to March 2015
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	Westernmost_Easting	double	-172.7813
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	Date		int
attribute	Date	_FillValue	int	2147483647
attribute	Date	actual_range	int	20150223, 20150330
attribute	Date	bcodmo_name	String	date
attribute	Date	description	String	Date of observation in four digit year; 2 digit month; 2 digit day (yyyymmdd) format
attribute	Date	long_name	String	Date
attribute	Date	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/
attribute	Date	units	String	unitless
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	_FillValue	double	NaN
attribute	longitude	actual_range	double	-172.7813, 168.0118
attribute	longitude	axis	String	X
attribute	longitude	bcodmo_name	String	longitude
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	description	String	Longitude with west negative.
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LONX/
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	actual_range	double	-19.9832, -18.179
attribute	latitude	axis	String	Y
attribute	latitude	bcodmo_name	String	latitude
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	description	String	Latitude with south negative.
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LATX/
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
variable	Station		String
attribute	Station	bcodmo_name	String	station
attribute	Station	description	String	name of the station
attribute	Station	long_name	String	Station
attribute	Station	units	String	unitless
variable	Cast		short
attribute	Cast	_FillValue	short	32767
attribute	Cast	actual_range	short	10, 210
attribute	Cast	bcodmo_name	String	cast
attribute	Cast	description	String	cast number
attribute	Cast	long_name	String	Cast
attribute	Cast	units	String	unitless
variable	depth		double
attribute	depth	_CoordinateAxisType	String	Height
attribute	depth	_CoordinateZisPositive	String	down
attribute	depth	_FillValue	double	NaN
attribute	depth	actual_range	double	3.0, 2002.0
attribute	depth	axis	String	Z
attribute	depth	bcodmo_name	String	depth
attribute	depth	colorBarMaximum	double	8000.0
attribute	depth	colorBarMinimum	double	-8000.0
attribute	depth	colorBarPalette	String	TopographyDepth
attribute	depth	description	String	depth of observation
attribute	depth	ioos_category	String	Location
attribute	depth	long_name	String	Depth
attribute	depth	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/DEPH/
attribute	depth	positive	String	down
attribute	depth	standard_name	String	depth
attribute	depth	units	String	m
variable	Sigma_theta		float
attribute	Sigma_theta	_FillValue	float	NaN
attribute	Sigma_theta	actual_range	float	21.71, 27.67
attribute	Sigma_theta	bcodmo_name	String	sigma_theta
attribute	Sigma_theta	description	String	potential density
attribute	Sigma_theta	long_name	String	Sea Water Sigma Theta
attribute	Sigma_theta	units	String	kilograms per meter cubed (kg/m3)
variable	NO3_NO2		String
attribute	NO3_NO2	bcodmo_name	String	NO3_NO2
attribute	NO3_NO2	description	String	nitrate+nitrite concentration ([NO3-+NO2-])
attribute	NO3_NO2	long_name	String	NO3 NO2
attribute	NO3_NO2	units	String	micromole (uM)
variable	NO3_NO2_d15N		String
attribute	NO3_NO2_d15N	bcodmo_name	String	15N of nitrate plus nitrite
attribute	NO3_NO2_d15N	description	String	nitrate+nitrite d15N (NO3-+NO2- d15N)
attribute	NO3_NO2_d15N	long_name	String	NO3 NO2 D15 N
attribute	NO3_NO2_d15N	units	String	per mil
variable	NO3_NO2_d15N_1_SD		String
attribute	NO3_NO2_d15N_1_SD	bcodmo_name	String	15N of nitrate plus nitrite
attribute	NO3_NO2_d15N_1_SD	description	String	nitrate+nitrite d15N standard deviation
attribute	NO3_NO2_d15N_1_SD	long_name	String	NO3 NO2 D15 N 1 SD
attribute	NO3_NO2_d15N_1_SD	units	String	per mil

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.